Individuals With Minor Injuries

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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Fair value of the amount outstanding under the credit facility.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Commitments and Contingencies - Additional Information (Details) £ in Millions	1 Months Ended	3 Months Ended	9 Months Ended		12 Months Ended
	Feb. 28, 2014 people	Sep. 27, 2020 USD ($)	Sep. 27, 2020 USD ($) facility	Sep. 27, 2020 GBP (£) facility	Dec. 31, 2019 USD ($)	Dec. 31, 2019 GBP (£)	Sep. 27, 2020 GBP (£)	Dec. 31, 2019 GBP (£)
Loss Contingencies [Line Items]
Amount drawn/utilized		$ 16,500,000
Number of bonding facilities for bank guarantees \| facility			2	2
Borrowing capacity		4,000,000.0	$ 4,000,000.0		$ 0
Credit facility, amount drawn		0	0
Capital expenditure commitments			800,000
Number of people with minor injuries \| people	3
Committed Banking Facilities
Loss Contingencies [Line Items]
Debt maximum borrowing capacity		150,000,000.0	150,000,000.0		150,000,000.0
Amount drawn/utilized			0		17,500,000
Bonding Facility For Bank Guarantees
Loss Contingencies [Line Items]
Debt maximum borrowing capacity		5,700,000	5,700,000		5,900,000		£ 4.5
Amount drawn/utilized			1,500,000	£ 1.2	2,300,000	£ 1.6
Letter of Credit
Loss Contingencies [Line Items]
Debt maximum borrowing capacity		$ 1,300,000	$ 1,300,000		1,300,000		£ 1.0	£ 1.0
U.K. pounds
Loss Contingencies [Line Items]
Number of bonding facilities for bank guarantees \| facility			1	1
United States of America, Dollars
Loss Contingencies [Line Items]
Amount drawn/utilized			$ 800,000
Number of bonding facilities for bank guarantees \| facility			1	1
United States of America, Dollars \| Bonding Facility For Bank Guarantees
Loss Contingencies [Line Items]
Amount drawn/utilized			$ 1,500,000		$ 400,000